Much easier to ski in a climbing boot than the other way round. I know from experience. So if the main focus of the day is climbing and you just want to use the skis for a fun approach use a climbing boot.
As far as fit goes it is very hit and miss. I've three different pairs of Diamirs (Mark I, Mark II and Eagles) and two different pairs of climbing boots (Sportiva Nepals and a Salomon B2 boot)that fit some but not all of them! You just have to try it out.
...and ski with consideration as I'm not always convinced the release is going to be as smooth.
Ski boots are OK to climb with on straightforward straight up ice/snow (to grade III say), but are hard work to use on any kind of mixed terrain.
I disagree. Thousands of ski-mountaineers aren't wrong. I've done mixed climbs in light touring boots (Scarpa Spirit?) fine, up to Scottish Vish at the back of the Argentiere glacier. Climbing boots are hopeless for providing any control while skiing - that's why 99% of ski-mountaineers wear touring boots. If you want to climb cutting edge routes, then just carry your climbing boots in your sac. Experiment with both options and see which you prefer, pref before you commit :)
It also depends on whether you're a competent skier and/or climber using ideal kit, before you try using the wrong kit!
I agree. I have heard very few people advocate skiing in a climbing boot rather than the other way round. I have never tried skiing in climbing boots but have done a fair bit of mountaineering in ski boots and never had any issues (upto to AD+ / WV type grades).
But both approaches can work & it probably comes down to personnel preference
> Much easier to ski in a climbing boot than the other way round.
I don't doubt that that is your experience of it, but that is a very rare view!
To jolly - this topic is regualrly explored on UKC. Consensus is that skiing in climbing boots on anything other than a very gentle incline is exceptionally challenging, and more importantly, a good way to do yourself a really nasty injury. Ski boots offer great stability for climbing but they are a bit heavier. If I wanted to do any downhill skiing in a climbing/skiing day, I'd opt for ski boots every time.
Your other option is to take a mini ski (Rossignol Ventura 99cm) that fits walking/climbing boots well for UPHILL skinning/snowshoeing, but lethal on DOWNHILL.
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